#!/bin/bash

#
# Copyright (C) 2012 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

#
# Generate all files we have templates for:
#   docs.html
#   ../src/camera_metadata_tag_info.c
#   ../src/camera_metadata_tags.h
#   ../../../../cts/tests/tests/hardware/src/android/hardware/camera2/cts/CaptureResultTest.java
#   ../../../../frameworks/base/core/java/android/hardware/camera2/CameraCharacteristics.java
#   ../../../../frameworks/base/core/java/android/hardware/camera2/CaptureRequest.java
#   ../../../../frameworks/base/core/java/android/hardware/camera2/CaptureResult.java

if [[ -z $ANDROID_BUILD_TOP ]]; then
    echo "Please source build/envsetup.sh before running script" >& 2
    exit 1
fi

thisdir=$(cd "$(dirname "$0")"; pwd)
fwkdir="$ANDROID_BUILD_TOP/frameworks/base/core/java/android/hardware/camera2/"
fwkdir_html="$ANDROID_BUILD_TOP/frameworks/base/docs/html"
ctsdir="$ANDROID_BUILD_TOP/cts/tests/tests/hardware/src/android/hardware/camera2/cts"
outdir="$ANDROID_PRODUCT_OUT/obj/ETC/system-media-camera-docs_intermediates"
out_files=()

function relpath() {
    python -c "import os.path; print os.path.relpath('$1', '$PWD')"
}

# Generates a file. Appends to $out_files array as a side effect.
function gen_file() {
    local in=$thisdir/$1
    local out=$thisdir/$2

    gen_file_abs "$in" "$out"
    return $?
}

function gen_file_abs() {
    local in="$1"
    local out="$2"
    local intermediates="$3"

    python $thisdir/metadata_parser_xml.py $thisdir/metadata_properties.xml $in $out

    local succ=$?

    if [[ $succ -eq 0 ]]
    then
        echo "OK: Generated $(relpath "$out")"
        if [[ "$intermediates" != "no" ]]; then
          out_files+=$'\n'" $out"
        fi
    else
        echo "FAIL: Errors while generating $(relpath "$out")" >& 2
    fi

    return $succ
}

# Print a list of git repository paths which were affected after file generation
function affected_git_directories() {
    local input_files=($@)
    local git_directories=()

    for file in "${input_files[@]}"; do
        local dir_path="$(dirname "$file")"
        echo "Trying to cd into $dir_path" >& /dev/null
        # Absolute path to the git repository root of that file
        local git_path="$(cd "$dir_path";
                          git rev-parse --show-toplevel 2> /dev/null)"
        if [[ $? -eq 0 ]]; then
            # Both staged and unstaged changes
            local diff_result="$(cd "$dir_path";
                                 git status --porcelain | egrep -c -v '^[?][?]')"
            echo "Diff result was $diff_result" >& /dev/null
            echo "Diff result was $diff_result" >& /dev/null
            if [[ $diff_result -eq 0 ]]; then
                echo "No changes in ${git_path}" >& /dev/null
            else
                echo "There are changes in ${git_path}" >& /dev/null
                git_directories+=("$git_path")
            fi
        fi
    done

    # print as result the unique list of git directories affected
    printf %s\\n "${git_directories[@]}" | sort | uniq
}

# Insert a file into the middle of another, starting at the line containing the
# start delim and ending on the end delim, both of which are replaced
function insert_file() {
    local src_part="$1"
    local dst_file="$2"
    local start_delim="/*@O~"
    local end_delim="~O@*/"

    local start_line="$(grep -n -F "${start_delim}" "${dst_file}" | cut -d: -f1)"
    local end_line="$(grep -n -F "${end_delim}" "${dst_file}" | cut -d: -f1)"

    # Adjust cutoff points to use start/end line from inserted file
    (( start_line-- ))
    (( end_line++ ))

    # Do some basic sanity checks

    if [[ -z "$start_line" ]]; then
       echo "No starting delimiter found in ${dst_file}" >& 2
       echo "FAIL: Errors in inserting into $(relpath ${dst_file})" >& 2
       return 1
    fi

    if [[ -z "$end_line" ]]; then
       echo "No ending delimiter found in ${dst_file}" >& 2
       echo "FAIL: Errors in inserting into $(relpath ${dst_file})" >& 2
       return 1
    fi

    if [[ "$start_line" -ge "$end_line" ]]; then
       echo "Starting delim later than ending delim: $start_line vs $end_line" >& 2
       echo "FAIL: Errors in inserting into $(relpath ${dst_file})" >& 2
       return 1
    fi

    local tmp_name=$(mktemp -t XXXXXXXX)

    # Compose the three parts of the final file together

    head -n "$start_line" "${dst_file}" > "${tmp_name}"
    cat "${src_part}" >> "${tmp_name}"
    tail -n "+${end_line}" "${dst_file}" >> "${tmp_name}"

    # And replace the destination file with the new version

    mv "${tmp_name}" "${dst_file}"
    echo "OK: Inserted $(relpath "$src_part") into $(relpath "$dst_file")"
    out_files+=$'\n'" $dst_file"
}

# Recursively copy a directory tree from $1 to $2. Pretty-prints status.
function copy_directory() {
    local src="$thisdir/$1" # Relative to directory of this script
    local dst="$2" # Absolute path

    if ! [[ -d $src ]]; then
        echo "FAIL: Source directory $src does not exist" >& 2
        return 1
    fi
    if ! [[ -d $dst ]]; then
        echo "FAIL: Destination directory $dst does not exist" >& 2
        return 1
    fi

    cp -R "$src" "$dst"
    local retval=$?

    if [[ $retval -ne 0 ]]; then
        echo "ERROR: Failed to copy $(relpath "$src") to $(relpath "$dst")" >& 2
    else
        echo "OK: Copied $(relpath "$src") to $(relpath "$dst")"
    fi

    return $retval
}

$thisdir/metadata-check-dependencies || exit 1
$thisdir/metadata-validate $thisdir/metadata_properties.xml || exit 1
$thisdir/metadata-parser-sanity-check || exit 1

# Generate HTML properties documentation
gen_file html.mako docs.html || exit 1

# Generate C API headers and implementation
gen_file camera_metadata_tag_info.mako ../src/camera_metadata_tag_info.c || exit 1
gen_file camera_metadata_tags.mako ../include/system/camera_metadata_tags.h || exit 1

# Generate Java API definitions
mkdir -p "${outdir}"
gen_file_abs CameraMetadataEnums.mako "$outdir/CameraMetadataEnums.java.part" no || exit 1
gen_file_abs CameraCharacteristicsKeys.mako "$outdir/CameraCharacteristicsKeys.java.part" no || exit 1
gen_file_abs CaptureRequestKeys.mako "$outdir/CaptureRequestKeys.java.part" no || exit 1
gen_file_abs CaptureResultKeys.mako "$outdir/CaptureResultKeys.java.part" no || exit 1
gen_file_abs CaptureResultTest.mako "$outdir/CaptureResultTest.java.part" no || exit 1

insert_file "$outdir/CameraMetadataEnums.java.part" "$fwkdir/CameraMetadata.java" || exit 1
insert_file "$outdir/CameraCharacteristicsKeys.java.part" "$fwkdir/CameraCharacteristics.java" || exit 1
insert_file "$outdir/CaptureRequestKeys.java.part" "$fwkdir/CaptureRequest.java" || exit 1
insert_file "$outdir/CaptureResultKeys.java.part" "$fwkdir/CaptureResult.java" || exit 1
insert_file "$outdir/CaptureResultTest.java.part" "$ctsdir/CaptureResultTest.java" || exit 1

# Copy ./images directory into javadoc directory
copy_directory "images" "$fwkdir_html" || exit 1

echo ""
echo "===================================================="
echo "Successfully generated all metadata source files"
echo "===================================================="
echo ""

echo "****************************************************"
echo "The following git repositories need to be committed:"
echo "****************************************************"
echo ""
affected_git_directories "${out_files[@]}"
echo ""

exit 0
